I'm visiting zhengzhou guangzhou yiwu n Hong Kong from 1st Jan advice How to plan its 12 days tour

Hey, this is the route I recommend: ZZ – Yiwu – Guangzhou – Hong Kong.
For the 12 days, you can plan 2 days for ZZ, 2 days in Yiwu, and 4 days for Guangzhou and HK for the rest time.

If you wanna fully enjoy yourself, I suggest you join a tour. The travel agency will arrange many worthy attractions for you.